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Reference.org
Bit cell
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<p>A bit cell is the length of <a href="/facts/Magnetic_tape/wj6IDTR1">tape</a>, the area of <a href="/facts/Disk_storage/hnsXRb5X">disc</a> surface, or the part of an <a href="/facts/Integrated_circuit/fjn6vg7C">integrated circuit</a> in which a single <a href="/facts/Bit/S972NSaD">bit</a> is recorded. The smaller the bit cells are, the greater the <a href="/facts/Memory_storage_density/FCqKjVdU">storage density</a> of the medium is. </p><p>In <a href="/facts/Magnetic_storage/QaK6oArm">magnetic storage</a>, the <a href="/facts/Magnetic_flux/jQMVxrnD">magnetic flux</a> or <a href="/facts/Magnetization/zxrtXzTN">magnetization</a> does not necessarily change at the boundaries of bit cells to indicate bit states. For example, the presence of a magnetic transition within a bit cell might record state 1, and the lack of such a transition might record state 0. Other <a href="/facts/Code/CSntvnEo">encodings</a> are also possible. </p>